The volume of acetylene required to obtain 242.5 g of dichloroethane is.

Let’s implement the solution:

According to the condition of the problem, we will write the data:
Chl -? m = 242.5 g

C2H2 + Cl2 = Cl – CH = CH – Cl (C2H2Cl2) – addition, dichloroethene was obtained;

Calculations according to the formulas of substances:
M (C2H2) = 26 g / mol;

M (C2H2Cl2) = 97 g / mol.

Let’s determine the amount of the product:
Y (C2H2Cl2) = m / M = 242.5 / 97 = 2.5 mol;

Y (C2H2) = 2.5 mol since the amount of substances is 1 mol.

We find the volume of the original substance:
V (C2H2) = 2.5 * 22.4 = 56 l

Answer: the volume of acetylene is 56 liters.